Friday the 13th Malware: New Flashback Trojan Horse Variant Follows Apple’s Xprotect Update
Apple has recently updated its Xprotect file quarantine system, used to check for malware downloaded by certain programs - notably Safari, Mail and iChat - but Intego has spotted a new variant of the Flashback Trojan horse, called OSX/FlashBack.J.
http://blog.intego.com/friday-the-13th-malware-new-flashback-trojan-horse-variant-follows-apples-xprotect-update/